发表机构
Department of Information Technology and Electrical Engineering, ETH Zürich - Swiss Federal Institute of Technology Zürich; Karlsruhe Institute of Technology; Max Planck Institute for Polymer Research; Faculty of Chemistry and Food Chemistry & Center for Advanced Electronics Dresden, TUD - Dresden University of Technology; Max Planck Institute of Microstructure Physics（苏黎世联邦理工学院信息与电气工程系; 卡尔斯鲁厄理工学院; 马克斯·普朗克聚合物研究所; 德累斯顿工业大学化学与食品化学学院及先进电子中心; 马克斯·普朗克微观结构物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究开发了一套超高真空拉曼平台（RVS），通过防止空气暴露实现石墨烯纳米带原位表征，监测其合成、温度演变及氧化反应，为低维量子材料提供可靠表征途径。
AI 中文摘要
原子级精确的石墨烯纳米带（GNRs）表现出由边缘拓扑和有限尺寸效应调控的可调电子和磁性质，使其成为下一代电子和自旋电子应用的多功能平台。然而，负责其磁性质的未配对π电子同时使其在环境条件下极易发生化学降解。这种内在反应性构成了一个核心实验挑战：在合成过程中以及在受控环境下，不破坏真空而获取对空气敏感的GNRs的振动和电子特征。一旦材料暴露于空气，标准表征技术将探测氧化或化学修饰的物种，而非原始形态。在此，我们通过开发一套自制的超高真空（UHV）拉曼平台克服了这一限制，该平台旨在通过防止空气暴露来保持样品完整性，并实现材料性质的原位研究。便携式拉曼真空手提箱（RVS）集成了温度控制和精确气体计量，允许在明确的热和化学环境下直接监测生长动力学、晶格动力学和反应性边缘响应。利用该平台，我们监测了7原子和9原子宽的扶手椅型GNRs（7-和9-AGNRs）的表面合成，量化了7-AGNR拉曼模式在宽温度范围（162-748 K）内的演变，并在受控O2暴露下解析了与反应性锯齿形位点氧化一致的化学变化。这些结果确立了UHV拉曼光谱与RVS作为在受控环境下获取低维量子材料内在振动特征的途径。
英文摘要
Atomically precise graphene nanoribbons (GNRs) exhibit tunable electronic and magnetic properties governed by edge topology and finite-size effects, which make them versatile platforms for next-generation electronic and spintronic applications. However, the unpaired pi-electrons responsible for their magnetic properties simultaneously make them highly susceptible to chemical degradation under ambient conditions. This intrinsic reactivity poses a central experimental challenge: accessing vibrational and electronic signatures of air-sensitive GNRs during synthesis and under controlled environments without breaking vacuum. Once the material has been exposed to air, standard characterization techniques would probe oxidized or chemically modified species rather than the pristine form. Here, we overcome this limitation by developing a home-built ultra-high vacuum (UHV) Raman platform designed to preserve sample integrity by preventing air exposure and to enable in situ investigation of material properties. The portable Raman vacuum suitcase (RVS) integrates temperature control and precise gas dosing, allowing direct monitoring of growth kinetics, lattice dynamics, and reactive-edge responses under well-defined thermal and chemical environments. Using this platform, we monitor the on-surface synthesis of 7- and 9-atom-wide armchair GNRs (7- and 9-AGNRs), quantify the evolution of 7-AGNR Raman modes over a wide temperature range (162-748 K), and resolve chemical changes upon controlled O2 exposure that are consistent with oxidation at the reactive zigzag sites. These results establish UHV Raman spectroscopy with the RVS as a route to accessing the intrinsic vibrational signatures of low-dimensional quantum materials under controlled environments.
